The Practice of the Calendar Rhythm Method Is Based on the Number

Short Answer

The practice of the calendar rhythm method is based on the number of days in each menstrual cycle.The fertile period is determined after monitoring each cycle for 6 months.The beginning of the fertile period is estimated by subtracting 18 days from the longest cycle and 11 days from the shortest.If the woman's cycles vary in length from 24 to 30 days,then her fertile period would be day _____ through day ______.